High voltage tolerant bias circuit with low voltage transistors

摘要

A circuit ( 200 ) can include a bias protection circuit ( 204 ) and a reference circuit ( 202 ). A bias protection circuit ( 204 ) can generate an internal power supply voltage (Vsuppi) from a higher device power supply (Vcch) with low voltage transistors and no resistors. A lower internal power supply voltage (Vsuppi) can be provided by buffer transistors (M 5 and M 6 ) that are biased according to limit section ( 206 ) that generates a bias voltage (biasn 2 ) based on a threshold voltage drop and a feedback bias voltage (biasn 1 ) from reference circuit ( 202 ).